Means for cleaning ignition plugs



Jan. 7, 1941. F, NALLINGER 2,227,841

MEANS FOR CLEANING IGNITION PLUGS Filed Nov. 19, 1938 lzvenfar'xPatented Jan. 7, 1941 UNITED STATES 2,227,841 MEANS FOR CLEANINGIGNITION PLUGS Fritz Nallinger, Stuttgart, Germany, assignor toDaimler-Benz Aktiengesellschaft, Stuttgart- Unterturkheim, GermanyApplication November 19, 1938, Serial No. 241,401 In Germany December17, 1937 6 Claims.

This invention relates to improved means for cleaning ignition plugs,and more particularly to the cleaning of said plugs during the runningof an internal combustion engine having automatic 5 timing control.

An object of-this invention is to provide a simple arrangement forcleaning the spark plugs of an internal combustion engine whiletheengine is in operation.

Another object of this invention is to' provide means for cleaning thespark plugs of an internal combustion engine provided with an automatictiming control, while the engine is in operation, running at part orfull load. 15 Still another object of this invention is to 'providemeans for cleaning the spark plugs of an internal combustion engineprovided with an automatic hydraulically operated ignition timingcontrol, while the engine is in operation.

20 -A further object of this invention is to provide an arrangement fortemporarily retarding the ignition timing of an internal combustionengine for-burning off and cleaning the impurities from the spark plugs,while the engine is in operation under the control of an automatictiming device.

set forth in the appended claims, and a preferredembodiment whereof ishereinafter described with 35 reference to the drawing which accompaniesand forms part of the specification, wherein:

Fig. 1 is a sectional side elevation of an internal combustion enginewith ignition-timing control means in accordance with the invention, thecontrol lever being seen in the intermediate position;

Fig. 2 shows the position for advanced ignition; and

Fig. 3 shows the position for retarded ignition.

The engine a is provided with an ignition con- 45 trol device indicatedgenerally at b, which can be adjusted for advanced and retardedignitionby a lever r. A cylinder with piston c which is connected to thelubricating oil passage by a connection f, serves for the operation ofthe lever r.

50 The piston c is loaded by a spring I which moves to the right, thatis tothe position for retarded ignition, upon the oil pressure beingrelieved. If i the revolution speed of the engine is so high that theoil pressure produced in the pipe 1 bythe 66 pump 9, overcomes thespring Z, .then the piston A. still further object of this invention isto is forced to the left and the lever r is set to' advanced ignition.The spring I is designed in such relation to the oil pressurethatretarded ignition is set at low revolution speed of the engine a andadvanced ignition at higher speed, that-is at 5 partial and full load.

The'pump g disposed in the crank-casev is driven from the engine shaft wthrough suitable means such as the bevel wheels q and the shaft t. Theoildrawn in from the sump u is forced through the passages h, i to theindividual lubrieating points of the engine. The passage 1 serving thecylinder 0 preferably" has a throttling point It, and is branched ofifrom the passage, 2 inadvance of the branches of the latter leading tothe lubricating points, one of which is seen in Figure 1. From thecylinder 0 a discharge passage e leads back to the oil sump u, a controlvalve d which can be actuated by hand, for exampleby the Bowden wire n,being included in this passage. The discharge valve 0! is normallymaintained in the closed position by a spring m, the valve arm abuttingagainst a stop 0. If now, against the oil pressure obtaining in thecylinder space 0, retarded ignition is to be set at partial or fullload, for example for the purpose of cleaning the plugs, the dischargevalve dis opened temporarily by means of the Bowden wire n and the oilpressure in the cylinder space c is relieved, the oil being permitted toflow freely to the sump u. The piston c is then displaced to the rightby the spring Z and the lever r is thereby set to retarded ignition. Inthe open position of the valve (1 its arm rests against a stop 11. Aftera short period of operation at partial or full load and with theignition device set to retarded ignition, the Bowden wire it may bereleased again, whereupon. the valve d is reclos'ed under the action ofthe spring m, being arrested in the closed 40 position by the stop 0.The oil pressure is then restored to the piston c and which is againmoved to the left so that the ignition device is again lever, the timingwill again be automatically determined by the speed of the engine.

It will therefore be seen that I have provided a device which fulfillsthe objects primarily stated, and while I have shown a single embodimentof my invention, it is clear that other forms thereof may readily beprovided without departing from my invention .as defined in the claimswhich follow.

I claim:

1. In combination, engine ignition timing means comprising a settinglever, a springreturned hydraulic piston device operatively connectedwith said lever, a pump driven from the engine, a pipe connectionbetween the delivery of said pump and the hydraulic pressure side ofsaid piston device, and a normally closed handcontrolled outlet operablefor relieving hydraulic pressure on said piston device, forthe purposedescribed. I

-2. In combination, engine ignition timing means comprising a settinglever, a spring-return hydraulic piston motor operatively connected withsaid lever, a pipe connection between said motor and the delivery of thelubricating pump of the engine, and a hand-controlled pressure reliefdevice for the cylinder of said motor.

3. In combination, engine ignition timing means comprising a. settinglever, a spring-return hydraulic piston motor operatively connected withsaid lever, a pipe connection between said 'means constantly operativein the closing direction upon said pressure relief device. a 5. Incombination, an internal combustion engine, ignition timing means forsaid engine, fluid pressure responsive means for varying said timingmeans, a source of fluid pressure responsive to an operating conditionof said engine for actuating said pressure-responsive means, and meansfor removing said pressure independently or any operating condition ofsaid engine.

6. An internal combustion engine having a spark adjusting device, alever for adjusting said device, a pressure-responsive device actingupon said lever, means for changing the pressure upon saidpressure-responsive device in accordance with an operating condition ofsaid engine, and means for relieving the pressure upon saidpressure-responsive device independently of any operating condition ofsaid engine.

FRITZ NALLINGER.

